This error is new to me, only occurring since updating to 3.35 a few hours ago:

When I first connect my H2O2, I get this error message

"calibre, version 3.35.0
ERROR: Error: Error communicating with device

BusyError: database is locked

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 87, in run
File "site-packages\calibre\gui2\device.py", line 540, in _sync_booklists
File "calibre_plugins.kobotouch_extended.device.driver" , line 476, in sync_booklists
File "site-packages\calibre\devices\kobo\driver.py", line 966, in sync_booklists
File "site-packages\calibre\devices\kobo\driver.py", line 2508, in update_device_database_collections
File "site-packages\calibre\devices\kobo\driver.py", line 3107, in set_core_metadata
File "c:\t\t\apsw-j1n8vs\apsw-3.23.1-r1\src\cursor.c", line 236, in resetcursor
BusyError: BusyError: database is locked
"

It doesn't seem to affect the functionality, I'm still able to copy books over and run the kobo utilities plugin.